ДЗ. Задание 6

from collections import defaultdict


def get_student():
    *student_name, class_number, score = input().split()
    return int(class_number), int(score)


def get_mid(scores):
    return sum(scores) / len(scores)


classes = defaultdict(list)

while True:
    try: class_number, score = get_student()
    except EOFError: break

    classes[class_number].append(score)

print(*map(get_mid, [classes[9], classes[10], classes[11]]))